Xi'an Dongmeng Group Co., Ltd. is one of the most reliable manufacturers and suppliers of 25crmnsini2moa alloy steel in China, also supports customized service. With abundant experience, we warmly welcome you to wholesale cheap products in stock here and get free sample from our factory. For price consultation, contact us.
25CrMnSiNi2MoA is a multi-alloy ultra-high-strength structural steel designed for extreme load-bearing and high-stress applications. By combining chromium (Cr), manganese (Mn), silicon (Si), nickel (Ni), and molybdenum (Mo), this grade achieves:
Exceptional strength-to-weight ratio
Superior fatigue resistance under cyclic loading
Excellent impact toughness and crack resistance
Stable performance after heat treatment
Compared with traditional high-strength steels such as 30CrMnSiA, this grade provides:
Higher tensile and yield strength
Better low-temperature toughness
Improved structural reliability in critical components
It is widely used in aerospace systems, defense engineering, and heavy-duty industrial structures.
Chemical Composition (wt%)
| Element | Content (%) |
|---|---|
| C | 0.22 – 0.28 |
| Si | 1.20 – 1.80 |
| Mn | 0.80 – 1.20 |
| Cr | 0.90 – 1.30 |
| Ni | 1.50 – 2.00 |
| Mo | 0.30 – 0.50 |
| P | ≤ 0.025 |
| S | ≤ 0.025 |
Specifications & Dimensions
| Product Type | Size Range | Length | Standard |
|---|---|---|---|
| Round Bar | 20 – 500 mm (0.79" – 19.7") | 3 – 12 m | GB |
| Forged Bar | 100 – 1200 mm (3.9" – 47.2") | Custom | GB / ASTM |
| Steel Plate | 10 – 200 mm (0.39" – 7.87") | Custom | GB |
| Forgings | As per drawings | Custom | EN / ASTM |
Tolerance: ASTM A29 / EN 10060
Surface Condition: Black / Peeled / Turned / Polished
Mechanical Properties (Typical, Q&T Condition)
| Property | Value |
|---|---|
| Tensile Strength | ≥ 1300 MPa |
| Yield Strength | ≥ 1000 MPa |
| Elongation | ≥ 9% |
| Impact Energy | ≥ 60 J |
| Hardness | 35 – 45 HRC |
Heat Treatment Process
Austenitizing: 850 – 900°C
Quenching: Oil quenching
Tempering: 200 – 600°C
Heat Treatment Benefits:
Refined grain structure
High strength with controlled toughness
Enhanced fatigue resistance
Stable performance in large sections
Key Features & Advantages
1. Ultra-High Strength
Designed for extreme structural loads and critical components.
2. Excellent Toughness
Nickel ensures impact resistance and crack prevention, even in harsh environments.
3. Superior Fatigue Resistance
Ideal for cyclic stress and vibration-heavy applications.
4. High Hardenability
Ensures uniform properties in large forgings and thick sections.
5. Structural Reliability
Maintains performance under long-term heavy load conditions.
Applications
25CrMnSiNi2MoA alloy steel is widely used in:
Aerospace structural components
Military and defense equipment
High-load mechanical structures
Heavy-duty shafts and transmission systems
Offshore and energy equipment
Comparison with Similar Grades
| Grade | Strength | Toughness | Application Level |
|---|---|---|---|
| 25CrMnSiNi2MoA | ⭐⭐⭐⭐⭐ | ⭐⭐⭐⭐⭐ | Aerospace / Military |
| 30CrMnSiA | ⭐⭐⭐⭐ | ⭐⭐⭐⭐ | High strength structures |
| 42CrMo | ⭐⭐⭐ | ⭐⭐⭐ | General engineering |
Inspection & Quality Assurance
We implement strict quality control systems:
Chemical composition analysis
Mechanical property testing
Ultrasonic Testing (UT)
Magnetic Particle Testing (MT)
Metallographic examination
✅ Third-party inspection: SGS / BV / TUV
✅ Certification: EN 10204 3.1 / 3.2
Product Delivery Standards
Delivery Condition: Q&T / Annealed / Normalized
Packaging: Export-grade seaworthy packing
Delivery Time: 10–30 days
Custom forging & machining available
Why Choose Our 25CrMnSiNi2MoA Steel?
Advanced smelting and refining technology
Stable ultra-high-strength performance
Large forging capability
Rich export experience
Engineering support for critical applications
FAQ – Frequently Asked Questions
Q1: What is 25CrMnSiNi2MoA steel used for?
It is used for ultra-high-strength structural components in aerospace and heavy-duty applications.
Q2: How strong is this steel?
It can reach ≥1300 MPa tensile strength after proper heat treatment.
Q3: Is it suitable for low-temperature environments?
Yes, thanks to nickel content, it has good low-temperature toughness.
Q4: Can you provide custom forgings?
Yes, we support large forgings and custom machining services.
Q5: What heat treatment is recommended?
Quenching and tempering (Q&T) is the standard process.
Contact Us
Looking for a reliable 25CrMnSiNi2MoA alloy steel supplier?
We provide:
Custom sizes & forgings
Competitive pricing
Fast global delivery
+8615769214734
office@dongmjd.com
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